A boy carts away wooden palettes scavenged from recycling bins to use as firewood on Jan. 15 in Thessaloniki, Greece. A steep increase in heating costs has forced many people to switch from heating oil to wood-burning stoves or fireplaces for warmth. But Illegal loggers are slashing through forests devastated by years of summer wildfires, and air pollution from wood smoke is choking the country's main cities. Nikolas Giakoumidis, AP

A haze of smoke hangs over the western suburbs on Jan. 15 in Athens. Petros Giannakouris, AP

Yannis Kasternopoulos warms himself over an open fire on Jan. 8 in Stamata. Petros Giannakouris, AP

Costas Tsakoyiannis splits logs in his firewood yard near a cemetery in Athens. Petros Giannakouris, AP